Influences of Plant Species Composition, Fertilisation and Lolium perenne Ingression on Soil Microbial Community Structure in Three Irish Grasslands
Influences of Plant Species Composition, Fertilisation and Lolium perenne Ingression on Soil Microbial Community Structure in Three Irish Grasslands
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DOI：
10.1007/s00248-011-9985-6
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发表时间：
2011-12
影响因子：
3.6
通讯作者：
A. Liliensiek;D. Thakuria;N. Clipson
中科院分区：
文献类型：
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作者：
A. Liliensiek;D. Thakuria;N. Clipson
半天然草地土壤经常被施肥用于农业改良。这种做法往往会导致本土植物群的丧失，而快速生长的氮敏感物种，如多年生黑麦草，则会取而代之。由于土壤微生物群落依赖于植物根系分泌物的碳源和氮源，植被的这种变化被认为会影响土壤微生物群落结构。在这项研究中，我们调查了不同植物物种、施肥和L.三个半自然的爱尔兰草原土壤中微生物群落的perenneingression。细菌和真菌群落组成的自动核糖体基因间隔区分析，并与环境因素的多元统计分析的社区变化。土壤类型对细菌和真菌群落有很强的影响，主要与土壤pH值，以及土壤碳，氮状况。在每种土壤类型中，植物种类组成是主要的影响因素，其次是氮肥，最后是酸性高地和中营养草地的Loliuminression。在碱性草地上，Loliumingression的作用比施肥强。我们的结果表明，植物物种多样性的变化强烈影响微生物群落结构，从而可能导致生态系统功能的显着变化。
Semi-natural grassland soils are frequently fertilised for agricultural improvement. This practice often comes at a loss of the indigenous flora while fast-growing nitrogen-responsive species, such asLolium perenne, take over. Since soil microbial communities depend on plant root exudates for carbon and nitrogen sources, this shift in vegetation is thought to influence soil microbial community structure. In this study, we investigated the influence of different plant species, fertilisation andL. perenneingression on microbial communities in soils from three semi-natural Irish grasslands. Bacterial and fungal community compositions were determined by automated ribosomal intergenic spacer analysis, and community changes were linked to environmental factors by multivariate statistical analysis. Soil type had a strong effect on bacterial and fungal communities, mainly correlated to soil pH, as well as soil carbon and nitrogen status. Within each soil type, plant species composition was the main influencing factor followed by nitrogen fertilisation and finallyLoliumingression in the acidic upland and mesotrophic grassland. In the alkaline grassland, however,Loliumingression had a stronger effect than fertilisation. Our results suggest that a change in plant species diversity strongly influences the microbial community structure, which may subsequently lead to significant changes in ecosystem functioning.